this doesn't make any sense to me!
first of all exchanges don't report volume separately for sells and buys so that you can "monitor" that. there is only one variable called "volume" and do you know why that is? it is because for every sell there is a buy. this is a market not a shop you go to to sell and buy from the owner. you sell and buy from others. so you can't say there are more/less sellers than buyers.
this "volume" is lower because the drop has slowed down drastically. whenever market movements are slower the volume is also lower. this only proves that investors are not sure what to do. they are all waiting for the next move to decide what they are going to do.
if there is another drop then they will sell and if there is a rise then they will FOMO buy. in any case volume will pick up as soon as there is a movement bigger than 10%